[Libdlo] display link + beagleboard has problem

[Yi Sun]

All,
I'm testing out my displaylink monitor with the beagleboard RevC I got
today. I can build and install the drivers without any problem. After I
plugin my monitor, I can see following messages in dmesg and a green screen
 4250.077270] usbcore: registered new interface driver udlfb
[ 4250.077301] VMODES initialized
[ 4267.119171] usb 1-2.4.1: new high speed USB device using ehci-omap and
address 7
[ 4267.240966] usb 1-2.4.1: configuration #1 chosen from 1 choice
[ 4267.248138] DisplayLink device attached
[ 4267.248382] ret control msg 0: 4 0500f0
[ 4267.406585] EDID XRES 0 YRES 0
[ 4267.406585] INIT VIDEO 0 800 480
[ 4267.406616] INIT VIDEO 1 1024 768
[ 4267.406616] INIT VIDEO 2 1280 1024
[ 4267.407104] ret control msg 1 (STD_CHANNEL): 16
[ 4267.420806] ret bulk 2: 156 156
[ 4267.421142] ret bulk 3: 0
[ 4267.421173] found valid mode...0
[ 4267.428405] screen base allocated !!!
[ 4267.438262] colormap allocated

But, after I started the gdm, I only got a black screen with a mouse cursor.
When I move my mouse, the cursor is moving with it. But the screen is still
black. Attached are my xorg log and xorg.conf.

Thanks
Yi
PS: I'm using the /dev/fb3.
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